CN212285734U

CN212285734U - Three-cylinder crankshaft mold resistance wall and variable bridge part composite structure

Info

Publication number: CN212285734U
Application number: CN202020332170.0U
Authority: CN
Inventors: 陈多; 潘成海; 董旭刚; 周世磊; 谭昌斌
Original assignee: Chongqing Dajiang Jiexin Forging Co ltd
Current assignee: Chongqing Dajiang Jiexin Forging Co ltd
Priority date: 2020-03-17
Filing date: 2020-03-17
Publication date: 2021-01-05
Anticipated expiration: 2030-03-17

Abstract

The utility model relates to a three-cylinder crankshaft mold resistance wall and variable bridge portion composite construction for the fashioned preforging die of three-cylinder crankshaft and finish forging die, including the last mould that has last die cavity, and have with the lower mould of the lower die cavity that goes up the die cavity and correspond, its characterized in that: the parting surfaces of the upper die and the lower die are space parting surfaces, the preforging die is provided with a resistance wall at a space parting section at a balance iron in the middle of the three-cylinder crankshaft, and the resistance wall is vertical to the parting line direction; and the variable bridge part of the finish forging die on the outer side of the three-cylinder crankshaft flange plate is of a neck-shaped structure with a contracted middle at the parting surface. The utility model increases the resistance wall along with the shape perpendicular to the parting surface in the space parting section of the preforging die, the resistance wall has simple structure and high die strength; the final forging die is provided with a variable bridge part on the outer side of the three-cylinder crankshaft flange plate, so that the metal flow resistance is further increased. The preforging resistance wall is combined with the finish forging variable bridge part, and the product size consistency is good.

Description

Three-cylinder crankshaft mold resistance wall and variable bridge part composite structure

Technical Field

The utility model relates to a forge technical field, concretely relates to three jar bent axle mould resistance walls and variable bridge portion composite construction.

Background

The three-cylinder engine has the advantages of low oil consumption, compact structure and low maintenance cost, and is more and more widely applied to the field of micro cars. The three-cylinder crankshaft is used as a core working component, and has great development prospect. The GEP3 three-cylinder crankshaft is formed by pre-forging and finish-forging, and the precision requirement of the product is high. The W3 balance iron on the GEP3 three-cylinder crankshaft is in a space die-splitting area, the resistance is small, and the metal flows fast. The balance block part in the middle of the blank flows to the horizontal direction in a large amount during blank manufacturing to form a flash, so that the metal volume in the cavity is limited. The width-depth ratio of the balance plate forging is about 0.3, the width-depth ratio is small, and the balance plate forging is not easy to fill. Therefore, the crankshaft has the following difficulties in forging: the width-depth ratio of the balance plate forging piece is small, the balance plate is deep, the balance iron structure is located in a space die division area, resistance is small, metal flowing speed is high, the balance block part of the blank flows in the horizontal direction in a large amount during pre-forging to form flash, therefore, the metal volume in a cavity is limited, and forging, filling and forming difficulty is high. Meanwhile, due to structural restriction, the GEP3 crankshaft forging has low material utilization rate and low forging economy.

The utility model discloses a three jar bent axle mould resistance wall structures in utility model patent with publication number CN204892838U, in this patent, its resistance wall perpendicular to forges the direction, still has the shortcoming to the packing of the die parting face of space abnormal shape split die.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the utility model provides a three-cylinder crankshaft mold resistance wall and variable bridge composite structure, in the space parting section of the preforging mold, the resistance wall is increased along with the shape perpendicular to the parting surface, the resistance wall structure is simplified, and the mold strength is high; the final forging die is provided with a variable bridge part on the outer side of the three-cylinder crankshaft flange plate, so that the metal flow resistance is further increased. The preforging resistance wall is combined with the finish forging variable bridge part, and the product size consistency is good.

In order to realize the above function, the utility model adopts the following technical scheme: the utility model provides a three-cylinder crankshaft mould resistance wall and variable bridge portion composite construction for the fashioned preforging die of three-cylinder crankshaft and finish forging die, including the last mould that has last die cavity, and have with the lower mould of the lower die cavity that corresponds of last die cavity, its characterized in that: the parting surfaces of the upper die and the lower die are space parting surfaces, the preforging die is provided with a resistance wall at a space parting section at a balance iron in the middle of the three-cylinder crankshaft, and the resistance wall is vertical to the parting line direction; and the variable bridge part of the finish forging die on the outer side of the three-cylinder crankshaft flange plate is of a neck-shaped structure with a contracted middle at the parting surface.

Furthermore, the height of the resistance wall relative to the parting surface in the cavity is L₂Width of L₄And L is not more than 8mm₂≤13mm,10mm≤L₄Less than or equal to 20 mm; the upper die is provided with a concave part matched with the resistance wall at the position corresponding to the resistance wall, and the distance of the concave part which is upwards concave relative to the die surface in the die cavity is L₃And L is not more than 18mm₃Less than or equal to 25 mm; the resistance wall is inboard parallel with last mould depressed part is inboard, and the upper end all leans out, is alpha with vertical direction contained angle, and alpha is not less than 10 and is not less than 20, go up the mould and be L with the clearance of lower mould in this slope department₁And L is not more than 1mm₁Less than or equal to 3 mm; the distance between the inner side of the resistance wall and the outer edge of the cavity is L₅And L is not more than 15mm₅≤20mm。

Furthermore, each joint surface of the resistance wall and the concave part of the upper die is in fillet transition, and the radius of the joint surface is R₁And R is not less than 3mm₁≤7mm。

Further, the width of the variable bridge part is H₁And H is not more than 4mm₁Less than or equal to 6mm and length of H₂And H is not more than 10mm₂Less than or equal to 20mm, the gap between the upper die and the lower die on the outer side of the variable bridge part is H₃,30mm≤H₃≤50mm。

Furthermore, an upward inclined plane is arranged on the upper die on the outer side of the variable bridge part, a downward inclined plane is arranged on the lower die, the upper inclined plane and the lower inclined plane are symmetrically arranged, the included angle between the inclined plane and the die parting surface is beta, and beta is more than or equal to 30 degrees and less than or equal to 60 degrees.

To sum up, the utility model discloses resistance wall with the preforging die combines in finish forging die bridge portion structure, and the resistance wall structure is retrencied, and mould intensity is high, effectively reduces material consumption, and product size uniformity is good.

Drawings

FIG. 1 is a schematic diagram of a three-cylinder crankshaft product.

Fig. 2 is a cross-sectional view C-C of fig. 1.

Fig. 3 is a schematic top view of the structure of fig. 1.

FIG. 4 is a schematic structural view of a three-cylinder crankshaft mold, with the upper and lower molds closed.

Fig. 5 is a schematic top view of the lower die of the finish forging die.

FIG. 6 is a schematic diagram of the three-dimensional structure of the lower die of the preforging die.

Fig. 7 is an enlarged view at M of fig. 6.

Fig. 8 is a sectional view taken along line E-E from a section a to a section b in fig. 4, showing a state where the upper and lower molds are clamped.

Fig. 9 is a sectional view taken along line a-a from section e to section f in fig. 5, showing a state where the upper and lower molds are clamped.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments and accompanying drawings.

Taking a GEP3 three-cylinder crankshaft as an example, FIGS. 1 to 3 are schematic structural diagrams thereof, the positions of a W1 balance iron 71, a W2 balance iron 72, a W3 balance iron 73, a W4 balance iron 74, a W5 balance iron 75 and a W6 balance iron 76 are respectively shown in the diagrams, wherein the width D of the W3 balance iron is 38.7mm, the height H is 112.7mm, the width-to-depth ratio of a forged piece is about 0.3, as shown in FIG. 2, the width-to-depth ratio is small, and the forged piece is not easy to fill in the forging process. Adopt three jar crankshaft mould resistance wall and variable bridge portion composite construction as shown in fig. 4-9, including last mould 1 that has last die cavity 11, and have with lower die 2 of the lower die cavity 21 that last die cavity 11 corresponds, its characterized in that: the parting surfaces 3 of the upper die 1 and the lower die 2 are space parting surfaces, the preforging die is provided with a resistance wall 4 at a space parting section at a balance iron in the middle of the three-cylinder crankshaft, and the resistance wall 4 is vertical to the parting line direction; and the variable bridge part 5 of the finish forging die on the outer side of the three-cylinder crankshaft flange is of a neck-shaped structure with a contracted middle at the parting surface 3.

Furthermore, the height of the resistance wall 4 relative to the parting surface 3 in the cavity is L₂Width of L₄And L is₂＝11mm,L ₄15 mm; the grinding tool is ensured to have enough strength at the resistance wall 4, and the deformation is reduced. The corresponding position of the upper die 1 and the resistance wall 4 is provided with a concave part matched with the resistance wall, and the distance of the concave part which is upwards concave relative to the die parting surface 3 in the die cavity is L₃And L is₃20 mm; the inner side of the resistance wall 4 is parallel to the inner side of the concave part of the upper die 1, the upper end of the resistance wall inclines outwards, the included angle between the upper end of the resistance wall and the vertical direction is alpha, the included angle between the upper end of the resistance wall and the vertical direction is 15 degrees, and the gap between the upper die 1 and the lower die 2 at the inclined position is L₁And L is₁2 mm; the distance between the inner side of the resistance wall 4 and the outer edge of the cavity is L₅And L is₅18 mm. Here a gap L₁And a distance L₅The resistance wall can ensure that the metal flows to bear larger resistance, the amount of the metal flowing out from the resistance wall is reduced, the metal is effectively filled to the balance iron of W3, and the full-mold rate is improved.

Furthermore, the connecting surfaces of the resistance wall 4 and the concave part of the upper die 1 are all fillet transition with the radius R₁And R is₁＝5mm。

Further, the width of the variable bridge part 5 is H₁And H is₁5mm, length H₂And H is₂15mm, the gap between the upper die 1 and the lower die 2 on the outer side of the variable bridge part is H₃,H₃＝40mm。

Further, the upper die 1 is arranged on the outer side of the variable bridge part 5 and provided with an upward inclined surface, the lower die 2 is provided with a downward inclined surface, the upper inclined surface and the lower inclined surface are symmetrically arranged, an included angle between the inclined surface and the die parting surface 3 is beta, and beta is 45 degrees.

When the metal deformation body points are likely to move in different directions in the metal shaping process, the body points will move along the direction with the least resistance. Therefore, the resistance wall 4 is arranged at the balance iron position W3 on the preforging die, the resistance wall 4 is vertical to the direction of the parting surface, the resistance of the metal flowing to the outside of the die cavity is increased, and the flowing of the metal in the forging process is changedAnd the direction of the steel is that the metal at the balance iron of W3 is filled fully, thereby improving the early forging quality. Meanwhile, the gap L between the resistance wall 4 and the concave part of the upper die 1₁The thickness of the die is only 2mm, the flowing resistance of metal is further increased, the interference between an upper die and a lower die is effectively avoided, the metal is prevented from flowing out of a parting surface too much to form a large flash, the filling of a balanced iron die cavity of the three-cylinder crankshaft W3 is obviously performed, and the material utilization rate is improved.

As shown in fig. 7, the final forging die bridge portion 5 has a transition inclined surface with an inclination angle β of 45 ° at the gap with the outer side thereof, and transition fillets R are respectively provided at the gaps between the transition inclined surface and the bridge portion 5 and between the outer side upper die and the outer side lower die of the bridge portion 5₂，R₂The radius is 5mm, so that the metal is slowly decompressed in the flowing process, the edge of the formed flash is smooth, burrs and sharp edges are reduced, and the safety of the subsequent processing process is ensured.

The utility model discloses in, resistance wall 4 sets up on the preforging die, and perpendicular to die joint direction for the resistance wall of original perpendicular to forging direction, can increase the resistance that the metal flows outside to the die cavity better, improves and forges full type rate, reduces the metal loss simultaneously, improves material utilization.

The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the above embodiments are only applicable to help understand the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the description should not be construed as a limitation to the present invention.

Claims

1. The utility model provides a three-cylinder crankshaft mould resistance wall and variable bridge portion composite construction for the fashioned preforging die of three-cylinder crankshaft and finish forging die, including last mould (1) that has last die cavity (11), and have with lower die (2) of lower die cavity (21) that last die cavity (11) correspond, its characterized in that: the parting surfaces (3) of the upper die (1) and the lower die (2) are space parting surfaces, the preforging die is provided with a resistance wall (4) at a space parting section at a balance iron in the middle of the three-cylinder crankshaft, and the resistance wall (4) is vertical to the parting line direction; and the variable bridge part (5) of the finish forging die on the outer side of the three-cylinder crankshaft flange is of a neck-shaped structure with a contracted middle at the parting surface (3).

2. The three-cylinder crankshaft mold resistance wall and variable bridge portion composite structure according to claim 1, characterized in that: the height of the resistance wall (4) relative to the parting surface (3) in the cavity is L₂Width of L₄And L is not more than 8mm₂≤13mm,10mm≤L₄Less than or equal to 20 mm; the corresponding part of the upper die (1) and the resistance wall (4) is provided with a concave part matched with the resistance wall, and the distance of the concave part which is upwards concave relative to the die parting surface (3) in the die cavity is L₃And L is not more than 18mm₃Less than or equal to 25 mm; resistance wall (4) inboard is inboard parallel with last mould (1) depressed part inboard, and the upper end all leans out, is alpha with vertical direction contained angle, and 10 is less than or equal to alpha and is less than or equal to 20, go up mould (1) and lower mould (2) and be L in the clearance of this slope department₁L1 is more than or equal to 1mm and less than or equal to 3 mm; the distance between the inner side of the resistance wall (4) and the outer edge of the cavity is L₅And L is not more than 15mm₅≤20mm。

3. The three-cylinder crankshaft mold resistance wall and variable bridge portion composite structure according to claim 1 or 2, characterized in that: the resistance wall (4) and the concave part of the upper die (1) are all in round corner transition with the radius of R₁And R is not less than 3mm₁≤7mm。

4. The three-cylinder crankshaft mold resistance wall and variable bridge portion composite structure according to claim 1, characterized in that: the width of the variable bridge part (5) is H₁Length of H₂And H is not more than 4mm₁≤6mm，10mm≤H₂Less than or equal to 20mm, the gap between the upper die (1) and the lower die (2) on the outer side of the variable bridge part is H₃,30mm≤H₃≤50mm。

5. The three-cylinder crankshaft mold resistance wall and variable bridge portion composite structure according to claim 1 or 4, characterized in that: the upper die (1) is provided with an upward inclined surface on the outer side of the variable bridge part (5), the lower die (2) is provided with a downward inclined surface, the upper inclined surface and the lower inclined surface are symmetrically arranged, the included angle between the inclined surface and the die parting surface (3) is beta, and the beta is more than or equal to 30 degrees and less than or equal to 60 degrees.